package com.bootdo.common.utils;

import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.util.*;
//import org.apache.poi.xssf.streaming.SXSSFSheet;
//import org.apache.poi.xssf.streaming.SXSSFWorkbook;
//import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
//import org.apache.poi.xssf.usermodel.XSSFRichTextString;


public class AnnoExportExcel {

	/**
	 * 工作薄对象
	 */
	private HSSFWorkbook wb;

	/**
	 * 工作表对象
	 */
	private HSSFSheet sheet;

	/**
	 * 样式列表
	 */
	private Map<String, CellStyle> styles;
	
	/**
	 * 当前行号
	 */
	private int rownum;

	/**
	 * 注解列表（Object[]{ ExcelField, Field/Method }）
	 */
	List<Object[]> annotationList = new ArrayList<>();
	
	/**
	 * 映射
	 */
	private Map<String, Map<String, String>> mapper = new HashMap<>();
	
	private String title;
	
	/**
	 * 构造函数
	 * @param title 表格标题，传“空值”，表示无标题
	 * @param cls 实体对象，通过annotation.ExportField获取标题
	 */
	public AnnoExportExcel(String title, Class<?> cls) {
		this(title, cls, 1);
	}

	/**
	 * 构造函数
	 * @param title 表格标题，传“空值”，表示无标题
	 * @param cls 实体对象，通过annotation.ExportField获取标题
	 * @param type 导出类型（1:导出模板；2：导出数据）
	 * @param groups 导入分组
	 */
	public AnnoExportExcel(String title, Class<?> cls, int type, int... groups) {
		this.title = title;
		// Get annotation field
		Field[] fs = cls.getDeclaredFields();
		for (Field f : fs) {
			// 获取字段上加的@Excel注解
			ExcelField ef = f.getAnnotation(ExcelField.class);
			if (ef != null && (ef.type() == 0 || ef.type() == type)) {
				// 根据字段注解中配置的groups进行分组
				if (groups != null && groups.length > 0) {
					boolean inGroup = false;
					for (int g : groups) {
						if (inGroup) {
							break;
						}
						for (int efg : ef.groups()) {
							if (g == efg) {
								inGroup = true;
								annotationList.add(new Object[]{ef, f});
								break;
							}
						}
					}
				} else {
					// 若无group属性，则直接将字段和对应的注解加入到一个全局的注解链表中，用于之后进行统一的排序
					annotationList.add(new Object[]{ef, f});
				}
			}
		}
		// Get annotation method
		Method[] ms = cls.getDeclaredMethods();
		for (Method m : ms) {
			// 获取方法上的注解
			ExcelField ef = m.getAnnotation(ExcelField.class);
			if (ef != null && (ef.type() == 0 || ef.type() == type)) {
				if (groups != null && groups.length > 0) {
					boolean inGroup = false;
					for (int g : groups) {
						if (inGroup) {
							break;
						}
						for (int efg : ef.groups()) {
							if (g == efg) {
								inGroup = true;
								annotationList.add(new Object[]{ef, m});
								break;
							}
						}
					}
				} else {
					annotationList.add(new Object[]{ef, m});
				}
			}
		}
		// 对字段进行排序 Field sorting
		Collections.sort(annotationList, (a1, a2) -> {
			return ((ExcelField) a1[0]).sort() - ((ExcelField) a2[0]).sort();
		});
		
		// Initialize
		List<String> headerList = new ArrayList<>();
		for (Object[] os : annotationList) {
			// 获取注解title属性值
			String t = ((ExcelField) os[0]).title();
			// 如果是导出，则去掉注释
			if (type == 1) {
				String[] ss = StringUtils.split(t, "**", 2);
				if (ss.length == 2) {
					t = ss[0];
				}
			}
			// 将字段名称保存在一个list中，交给初始化方法使用
			headerList.add(t);
		}
		initialize(title, headerList);
	}

	/**
	 * 构造函数
	 * @param title 表格标题，传“空值”，表示无标题
	 * @param headers 表头数组
	 */
	public AnnoExportExcel(String title, String[] headers) {
		initialize(title, Arrays.asList(headers));
	}

	/**
	 * 构造函数
	 * @param title 表格标题，传“空值”，表示无标题
	 * @param headerList 表头列表
	 */
	public AnnoExportExcel(String title, List<String> headerList) {
		initialize(title, headerList);
	}

	/**
	 * 初始化函数
	 * @param title 表格标题，传“空值”，表示无标题
	 * @param headerList 表头列表
	 */
	private void initialize(String title, List<String> headerList) {
		this.wb = new HSSFWorkbook();
		this.sheet = wb.createSheet();
		this.styles = createStyles(wb);
		// Create title
		if (StringUtils.isNotBlank(title)) {
			Row titleRow = sheet.createRow(rownum++);
			titleRow.setHeightInPoints(30);
			Cell titleCell = titleRow.createCell(0);
			titleCell.setCellStyle(getCellStyle("title"));
			titleCell.setCellValue(title);
			sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(), titleRow.getRowNum(), titleRow.getRowNum(),
					headerList.size() - 1));
		}
		// Create header
		if (headerList == null) {
			throw new RuntimeException("headerList not null!");
		}
		Row headerRow = sheet.createRow(rownum++);
		headerRow.setHeightInPoints(16);
		for (int i = 0; i < headerList.size(); i++) {
			Cell cell = headerRow.createCell(i);
			cell.setCellStyle(getCellStyle("header"));
			String[] ss = StringUtils.split(headerList.get(i), "**", 2);
			if (ss.length == 2) {
				cell.setCellValue(ss[0]);
				Comment comment = this.sheet.createDrawingPatriarch()
						.createCellComment(new HSSFClientAnchor(0, 0, 0, 0, (short) 3, 3, (short) 5, 6));
				comment.setString(new HSSFRichTextString(ss[1]));
				cell.setCellComment(comment);
			} else {
				cell.setCellValue(headerList.get(i));
			}
//			sheet.trackAllColumnsForAutoSizing();
			sheet.autoSizeColumn(i);
		}
		for (int i = 0; i < headerList.size(); i++) {
			int colWidth = sheet.getColumnWidth(i) * 2;
			sheet.setColumnWidth(i, colWidth < 3000 ? 3000 : colWidth);
		}
		// log.debug("Initialize success.");
	}

	/**
	 * 创建表格样式
	 * @param wb 工作薄对象
	 * @return 样式列表
	 */
	private Map<String, CellStyle> createStyles(Workbook wb) {
		Map<String, CellStyle> styles = new HashMap<String, CellStyle>();

		CellStyle style = wb.createCellStyle();
		style.setAlignment(HorizontalAlignment.CENTER);
		style.setVerticalAlignment(VerticalAlignment.CENTER);
		Font titleFont = wb.createFont();
		titleFont.setFontName("Arial");
		titleFont.setFontHeightInPoints((short) 16);
		titleFont.setBold(true);
		style.setFont(titleFont);
		styles.put("title", style);

		style = wb.createCellStyle();
		style.setVerticalAlignment(VerticalAlignment.CENTER);
		style.setBorderRight(BorderStyle.THIN);
		style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setBorderLeft(BorderStyle.THIN);
		style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setBorderTop(BorderStyle.THIN);
		style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setBorderBottom(BorderStyle.THIN);
		style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
		Font dataFont = wb.createFont();
		dataFont.setFontName("Arial");
		dataFont.setFontHeightInPoints((short) 10);
		style.setFont(dataFont);
		styles.put("data", style);

		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
		style.setAlignment(HorizontalAlignment.LEFT);
		styles.put("data1", style);

		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
		style.setAlignment(HorizontalAlignment.CENTER);
		styles.put("data2", style);

		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
		style.setAlignment(HorizontalAlignment.RIGHT);
		styles.put("data3", style);

		style = wb.createCellStyle();
		style.cloneStyleFrom(styles.get("data"));
		// style.setWrapText(true);
		style.setAlignment(HorizontalAlignment.CENTER);
		style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
		style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
		Font headerFont = wb.createFont();
		headerFont.setFontName("Arial");
		headerFont.setFontHeightInPoints((short) 10);
		headerFont.setBold(true);
		headerFont.setColor(IndexedColors.WHITE.getIndex());
		style.setFont(headerFont);
		styles.put("header", style);
		
		return styles;
	}

	/**
	 * 添加一行
	 * @return 行对象
	 */
	public Row addRow() {
		return sheet.createRow(rownum++);
	}

	/**
	 * 添加一个单元格
	 * @param row 添加的行
	 * @param column 添加列号
	 * @param val 添加值
	 * @return 单元格对象
	 */
	public Cell addCell(Row row, int column, Object val) {
		return this.addCell(row, column, val, 0, null, null);
	}

	/**
	 * 添加一个单元格
	 * @param row 添加的行
	 * @param column 添加列号
	 * @param val 添加值
	 * @param align 对齐方式（1：靠左；2：居中；3：靠右）
	 * @param format 
	 * @return 单元格对象
	 */
	public Cell addCell(Row row, int column, Object val, int align, String format, String map) {
		Cell cell = row.createCell(column);
		String key = "data" + (align >= 1 && align <= 3 ? align : "");
		CellStyle style = getCellStyle(key);
		if (StringUtils.isNotBlank(map)) {
			val = getMapper(map).get(String.valueOf(val));
		}
		try {
			if (val == null) {
//				cell.setCellValue("");
			} else if (val instanceof String) {
				cell.setCellValue((String) val);
			} else if (val instanceof Integer) {
				cell.setCellValue((Integer) val);
			} else if (val instanceof Long) {
				cell.setCellValue((Long) val);
			} else if (val instanceof Double) {
				cell.setCellValue((Double) val);
			} else if (val instanceof Float) {
				cell.setCellValue((Float) val);
			} else if (val instanceof Date) {
				style = getCellStyle(key + format);
				cell.setCellValue((Date) val);
			} else {
				cell.setCellValue(val.toString());
			}
		} catch (Exception ex) {
			// log.info("Set cell value ["+row.getRowNum()+","+column+"] error: " + ex.toString());
			cell.setCellValue(val.toString());
			ex.printStackTrace();
		}
		cell.setCellStyle(style);
		return cell;
	}

	/**
	 * <b>Description:</b><br> 
	 * 获取映射
	 * @param map
	 * @return
	 * <b>Author:</b> abeholder
	 */
	private Map<String, String> getMapper(String map) {
		Map<String, String> _map = mapper.get(map);
		if (_map == null) {
			String[] ss = StringUtils.split(map, ";");
			_map = new HashMap<>();
			for (int i = 0; i < ss.length; i++) {
				String[] sx = StringUtils.split(ss[i], ":");
				_map.put(sx[0], sx[1]);
			}
			mapper.put(map, _map);
		}
		return _map;
	}

	/**
	 * 添加数据（通过annotation.ExportField添加数据）
	 * @return list 数据列表
	 */
	public <E> AnnoExportExcel setDataList(List<E> list) {
		for (E e : list) {
			int colunm = 0;
			Row row = this.addRow();
//			StringBuilder sb = new StringBuilder();
			for (Object[] os : annotationList) {
				ExcelField ef = (ExcelField) os[0];
				Object val = null;
				// Get entity value
				try {
					if (StringUtils.isNotBlank(ef.value())) {
						val = Reflections.invokeGetter(e, ef.value());
					} else {
						if (os[1] instanceof Field) {
							val = Reflections.invokeGetter(e, ((Field) os[1]).getName());
						} else if (os[1] instanceof Method) {
							val = Reflections.invokeMethod(e, ((Method) os[1]).getName(), new Class[]{},
									new Object[]{});
						}
					}
				} catch (Exception ex) {
					// Failure to ignore
					// log.info(ex.toString());
					val = "";
					ex.printStackTrace();
				}
				this.addCell(row, colunm++, val, ef.align(), ef.format(), ef.map());
//				sb.append(val + ", ");
			}
			// log.debug("Write success: ["+row.getRowNum()+"] "+sb.toString());
		}
		return this;
	}

	/**
	 * 输出数据流
	 * @param os 输出数据流
	 */
	public AnnoExportExcel write(OutputStream os) throws IOException {
		wb.write(os);
		return this;
	}

	/**
	 * 输出到客户端
	 * @param fileName 输出文件名
	 */
	public AnnoExportExcel write(HttpServletResponse response, String fileName) throws IOException {
		response.reset();
		response.setContentType("application/octet-stream; charset=utf-8");
		response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fileName, "utf-8"));
		try (ServletOutputStream sos = response.getOutputStream()) {
			write(sos);
		}
		return this;
	}
	
	public AnnoExportExcel write(HttpServletResponse response) throws IOException {
		return write(response, title + ".xls");
	}

	/**
	 * 输出到文件
	 * @param name 输出文件名
	 */
	public AnnoExportExcel writeFile(String name) throws FileNotFoundException, IOException {
		try (FileOutputStream os = new FileOutputStream(name)) {
			this.write(os);
		}
		return this;
	}

	/**
	 * 清理临时文件
	 */
	public AnnoExportExcel dispose() {
//		wb.dispose();
		return this;
	}
	
	/**
	 * <b>Description:</b><br> 
	 * 获取 DataFormat CellStyle
	 * @param key
	 * @return
	 * <b>Author:</b> abeholder
	 */
	public CellStyle getCellStyle(String key) {
		CellStyle cellStyle = styles.get(key);
		if (cellStyle == null) {
			String[] ss = StringUtils.split(key, "#");
			if (ss.length < 2) {
				throw new IllegalArgumentException("cannot parse the key.");
			}
			cellStyle = styles.get(ss[0]);
			CellStyle cs = wb.createCellStyle();
			cs.cloneStyleFrom(cellStyle);
			cs.setDataFormat(wb.createDataFormat().getFormat(ss[1]));
			styles.put(key, cs);
			cellStyle = cs;
		}
		return cellStyle;
	}

}